Nortel Communication Server 1000 Maintenance Manual page 104

104 1.5 Mb DTI/PRI maintenance
ATLP 0 disables one idle channel at random and performs a single
channel self-test. This channel cannot be specified; it is selected by
software.
ATLP 1 attempts to test the whole DTI/PRI loop. If ATLP 1 finds all
channels in the target link idle, it takes the whole link down and tests it.
The node where the self-test is performed sends out a Yellow alarm while
the link is down.
Ensure that LD 73 TRSH RALM is not exceeded at the far end due to the
automatic loop test. If TRSH RALM (default = 3) is exceeded at the far
end, trunks remain out of service.
Remote loopback and remote self-test
The remote loopback and the remote self-test are performed manually per
loop (or per system card).
Remote loopback
The RLBK C command puts the DTI/PRI into loopback toward the far end
so a remote self-test can be performed on equipment at the far end.
Remote loopback test
The remote self-test, also called the external loopback test, checks the
integrity of the DTI/PRI through an external T-1 loopback. If the Remote
Loopback command (RLBK) is executed at the far-end system prior to
executing the Remote self-test command (RMST) at the near end, the
integrity of the DS-1 facility is tested from end-to-end.
Procedure 15
Coordinating the tests
Step
1
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.
Note:
The DTI/PRI loop (card) being tested must be disabled.
Note:
The DTI/PRI channel or loop (card) being tested must be
disabled.
Action
When a technician at the far end requests a remote loopback on
the local system:
a Enter the following command in LD 96 to disable the DCHI
(for PRI DCHL or BCHL):
DIS DCH N
b Enter the following command in LD 60 to disable the DTI/PRI
card and activate remote loopback mode:
Nortel Communication Server 1000
ISDN Primary Rate Interface Maintenance
NN43001-717 03.01
11 May 2009